Mold illness refers to the health effects of a wide range of different types of mold (mould), their related microbial agents and associated toxins.
While allergic reactions are a commonly reported effect of mold exposure, molds can also cause other types of reaction, including irritation, inflammation, infection and toxicity. Molds can produce a wide range of symptoms affecting mental as well as physical health and their effects range in severity from minor to fatal.
Molds and their many related microbial agents are ubiquitous throughout the biosphere. While most of those found in the outdoor environment are not hazardous to humans, many of those lurking within buildings can be, and, since molds form a common component of the dust found within homes and workplaces, they are difficult to avoid. Substantial and statistically significant increases in the risks of both respiratory infections and bronchitis have been associated with the mold found in homes,  and as many as 21% of asthma cases may result from mold exposure. 
Humans have lived with molds throughout history, but, in the 20th and 21st centuries we have increasingly taken to living in enclosed domestic environments that encourage the proliferation of mold. We have also adopted practices that have separated us from the helminths that, since time immemorial, have modulated our immune response to environmental factors such as mold. (See Humans need helminths.) A large part of the solution to mold-related illness is therefore to modify our home and work environments to prevent mold growth, and to reconstitute our personal biomes by reintroducing mutualistic helminths to optimise our immune function.
Below are quotes from self-treaters who have used helminthic therapy to address their mold issues.
However, anyone with mold sensitivity who uses helminthic therapy will only reap the full benefits possible from this treatment if they also reduce their exposure to mold.
Continuing, or new, mold exposure may overwhelm the benefits of hosting helminths.
- Toxic: Heal Your Body from Mold Toxicity, Lyme Disease, Multiple Chemical Sensitivities, and Chronic Environmental Illness
- This is a great book for anyone who is unsure how to navigate mould toxicity. Dr Neil Nathan explains everything very well and he has a useful website that proposes a mould protocol, and offers a list of practitioners in various regions. The book is also on audible. It helped me find a mould specialist that is organising appropriate tests. 
- Preliminary research identifies helminthic therapy as a possible treatment strategy to arrest the chronic inflammatory response, induced by mold and other biotoxins.
- A helpful support group thread.